#content{
    height: 300px;
    width:380px;
    padding:0px;
    margin:0px;
    overflow:hidden;
    font-size:12px;
    line-height:25px;
    border:1px #000 solid;
}
ul,li{
    padding:0px;
    margin:0px;
    list-style:none;
}
/*父级元素相对定位*/
#content ul{
    position:relative;
}
.tipText,.tipBg{
    position:absolute;
    width:380px;
    height:25px;
    top:216px;
}
.tipText{
    color:white;
    /*z-index:1;*/
}
.tipBg{
    background:#000;
    opacity:0.5;/*背景透明度*/
    filter：Alpha(opacity=50)
}